top of page
Reticulocyte Count


The reticulocyte count is performed on the Sysmex XN Series Hematology Analyzer. This analyzer uses several technologies including flow cytometry, which determines the number of reticulocytes present in the patient's blood.

Test Utility

This test provides information about RBC (red blood cells) production. A reticulocyte is an immature RBC. The presence of reticulocytes in peripheral blood can indicate if the bone marrow is producing enough RBCs.

Specimen Collection and Preparation

Whole blood sample in the following tubes:

  • Preferred specimen: Lavender Top K2 EDTA tube. (Minimum Whole Blood: 1.5 mL)

  • Also acceptable: Light blue top sodium citrate tube (Minimum Whole Blood: 1.5 mL)

Specimen Storage and Stability

Store whole blood at the following temperatures:

  • Room temperature: 24 hours (<8 hours ideal)

  • Refrigerated 2°C to 8°C:  72 hours

  • Frozen: Do not freeze

Specimen Rejection

  • Insufficient sample volume

  • Sample not stored at proper temperature

  • Frozen whole blood

  • Hemolyzed samples

  • Severely lipemic specimens

  • Specimen labeled incorrectly or not labeled

Reference Pages


Monday – Sunday, 16 hours a day  

Result available within 24 hours of receipt in laboratory 

NOTE: Specimens are refrigerated (2-8°) for 7 days before disposal


Vibra Health Laboratory  

1307- A, Allen Dr Troy, MI 48083 

(248) 846-0663

bottom of page